I chatted with one of your reps who told me there was no replacement for the defrost timer for my old fridge. I looked at two of the parts you did carry and decided to order both. The timer in my refrigerator was hidden behind a metal shield so the exact model wasn't apparent. I could find no paperwork that came with the fridge. When the parts arrived quickly from you folks I dismantled the timer assembly and found one of the timers fit the space. The original appears to be a 9Amp 120v which may have a 12-hour cycle time and 21-minute defrost. The new timer Defrost Timer 215846604 fits the bill even though it may have a 10amp with a 6-hour cycle time, an additional defrost cycle is not worrisome. The original part had an exposed metal housing for the motor and a grounding wire to the metal shield housing. That was no longer needed and so was removed. The second timer ordered, Defrost Timer 5304518034/ AP6799886 will not be needed as it did not fit the space behind the metal housing in the top back of the refrigerator compartment. I should add that the metal shield also holds the compartment light socket and so cannot be modified efficiently. All is well now. Cooling and defrost cycles are working.